Monolithic Chain Shell: A Super Protector Chain Shell is one of several materials that can be used to cover and protect an Airform. Chain Shell is simply another name for exterior, old-fashioned, heavy-duty stucco. Before applying Chain Shell, make sure that the dome has no leaks. It must be watertight and the final flashing details must be in place. Applying a cover such as Chain Shell will significantly extend the life of the Airform.